Unable to umount greyed-out datastore due to Storage I/O Control
During a storage migration the SAN team had to create and delete multiple LUNs for the VMware vSphere 5.1 environment.
Accidentally they deleted a LUN that wasn’t deleted in VMware vSphere. Gladly there were no more virtual machine on that datastore. When I tried to unmount the volume I got the following error:
The message is clear. I cannot unmount the datastore because SIOC is enabled. But I can’t disabled SIOC because the datastore ain’t available anymore. There are 2 solutions for this.
- Reboot the hosts. During boot SIOC won’t be enabled on the datastore anymore and you will be able to unmount the datastore.
- SSH to the ESXi console and stop the SIOC deamon by entering:
/etc/init.d/storageRM stop
Give a Rescan all on the storage adapter and enable the SIOC deamon again with the command:
/etc/init.d/storageRM start
Now you’re able to unmount the datastore.
Option 2 is nice if you don’t want or are unable to reboot your vSphere hosts.
Michael Wilmsen is a experienced VMware Architect with more than 20 years in the IT industry. Main focus is VMware vSphere, Horizon View and Hyper Converged with a deep interest into performance and architecture.
Michael is VCDX 210 certified, has been rewarded with the vExpert title from 2011, Nutanix Tech Champion and a Nutanix Platform Professional.
